Shockproof mounting



June 2, 1942. w. A. scHRAK 2,284,771

' SHQQKPROOF- MOUNTING Filed Sept. 20, 1941 I Patented Julie 2, 194a 2,2s4ju William A. Schrak, East Orange,

to Bendix Aviation Corporation, lnd., a corporation or Delaware N. a, was

South Bend,

Application September 20, 194i, Serial No. 411,72?

' (cl. sis-3st) 5 Claims.

This invention relates to shock-proof mountings, and more particularly to a system whereby a unit may be resiliently suspended in a vehicle such as an aircraft.

It is an object of the present invention to provide a shock-proof mounting wherein resilient material is bonded to rigid iastenings in a manner to provide a serviceable and eficient mounting.

Other objects of the invention include the provision of means whereby a unit to be suspended may be readily suspended or removed from sus pension, and whereby failure of the resilient sus-' pension will not entail a loss or breakage of the unit suspended.

Other objects will appear from a study of the fol-lowing specification when made in conjunction with the attached drawing, throughout which like numerals designate like parts.

Fig. 1 is a plan View, with certain parts in section, of an element suspended in a shock-proof mounting of the present invention. I

'Fig. 2 is an elevational view, partly in section, taken along the line 2--2 of Fig. 1..

Having reference to the drawing, Ill represents a unit, such as a voltage regulator or transformer, which isto be mounted for shock-proof suspenslot: in a base member H, which may be readily attached to the. interior of an aircraft cabin.

Unit has four cylindrical recesses I2, formed in the flange l3 of unit l0, and these recesses are I disposed symmetrically with two on opposite sides of the unit Ill.

The mounting base H has aligned scrcw threaded apertures 14 opposite the recesses l2, and these apertures carry hollow or cup-shaped screws-threaded members l5, of steel, aluminum,

plug it into closer engagement with the inner wall of tube it.

One end of tube I8 is fixed to the inner surface of cup-shaped member l5, and the other end of tube It is fixed to cylindrical shoulder l9,'by

means of a rubber-to-metal bond, designated by the lines 23 and 2d. The bond extending through the areas represented by lines 23 and 26 may be formed by any of. the well-known bonding procedures, by which rubber or the like may be held I with firm. adherence to a metal surface.

Assuming unit ill to be suspended as shown, if it is desired to remove the unit for servicing or for replacement of a defective unit, the operator merely unscrews members it from one side of base member It, upon which the unit it) may be withdrawn from the two head'members on the other side of the base ii, The provision of wings It makes the insertion and removal of cupshaped members I? a very quick, and yet positive, procedure. It should be noted that shanks 22 extend within the projection of the outer portion of cup-shaped members it; so'that uponfailure of resilient tube It, shank 22 will strike upon the inner surface of member l5, and carry the weight of the unit it, and thus avoid the loss or breakage of the unit should it drop completely from its suspension.

Heads 20 may fit within recesses 12 with a.

close, but free, sliding fit, so that quick insertion and withdrawal of heads 20 may be effected.

It will be seen that by the use of a shock-proof mounting of the type herein described, a unit In to be resiliently suspended maybe maintained securely in space, and yet, be suspended in a manner which prevents the transfer of harmful brass or the like, with integral adjusting means, 1

such as wing members "5.. The interior wall of each of the cup-shaped members I 5 is a cylindrical, and has a flat bottom surface ll. A short section of resilient tubing, such as rubber, Neo-' prene or the like, designated as l8, has one end fitted within member l5, and its other *end embracing a, cylindrical shoulder portion 19 of a head member 20, which is also shown as being cylindrical. Carried within cup-shaped member l5, and against bottom surface ii, there is a resilient plug member 2| of rubber, Neoprene or the like, which has a tight fit with the inner surface of'tube 18. Head member 20 and shoulder portion l9 thereof, terminate in a cyllndrically shaped shank 22, which is of such length that its end presses slightly into resilient plug 2|, forcing vibration from base II to unit ID. The resilience of each of the tubes I8 is such that free, lateral displacement of unit It may be effected, and

the projection of shanks 22 into resilient plugs- 2| will be such that excessive side play of unit ID will be eliminated, without, however, impair ing of the efliciency of the damping provided by the resilient mounting shown. The tension or rigidity of the coupling between unit Ill and base ll may be regulated by advancing members 45 in or out, as desired, thus changing the tension of tubes l8 and consequently, the resilient coupling between unit l0 and base I I.

It is obvious that the invention may be embodied in forms other than that shown. For this reason, it is desired not to limit the invention to the particular example chosen to describe it, but only by the scope of the appended claims.

Whatis claimed is:

base, a member to be resiliently suspended plus,-

1.- A resilient suspension comprising a rigid said base,' a plurality of cylindrical recesses formed in said member on opposite sides thereof,

v a threaded aperture formed in said base opposite. each of said recesses, a plug threaded therein,

in each of said recesses, said head member having a cylindrical shoulder of less diameter than said head member, said shoulder-having said section of tubular resilient material bonded thereto, and a shank portion integral with said head and shoulder projecting into said resilient 2. A resilient suspension comprising a rigid base, a unit to be suspended from said base, a eylindrical recess formed in said unit, an aligned hole formed in said ,base, a suspension pin assembly spanning said base, through said hole, 'andsaid recess, said assembly including a cupshaped member having means for securing i to said base a length of resilient tubing having one endwithin said cup-shaped member and bonded thereto; a resilient plug within said tubing and within said cup-shaped member, a rigid cylindri cal head member projecting from the other end of said tubing and bonded thereto, said head member lying within said recess, and a shank portion carried by said head; tubing contacting said plug. \f

3. A resilient suspension comprising a base, a unit to be suspended from said base, aligned openings Iormed in said base and in said unit, a

member within said suspending member spanning said base and said unit through said aligned openings, said member including a hollow member having means for securing it to said base, a head fitting into the opening in'said unit, a length of resilient tubing having one end carried within said hollow member and the other carried on said head, a resillent plug within said tubing and within said hollow membenand a shank portion formed on said i in compressing relation head within said tubing to said plug. 4

QA member for extending between a fixed base and a unit to be resiliently suspended from said base, including a base-engaging portion and a unit-engaging portion, said base-engaging portion being generally cup-shaped, said unit-engaging portion being cylin'drical, a resilient tube extending from said base-engaging portion to said unit-engaging portion and bonded to each, a'resilient plug carried within said base-engaging portion and a shank member carried within said tube by said unit-engaging portion and in contact with said plug.

5. A resilient suspending member to be secured to a base and to a unit to be suspended, said member including a-base-engaging portion and a unit-engaging portion, said base-engaging portion having a hollow portion, said unit-engaging portion including a cylindrical shoulder, a resilient tube extending from said base-engaging portion to said unit-engaging portion and securedto said shoulder, a resilient" plug carried within said base-engaging portion and a shank member carried within said tube and contacting said plug.

' WELIAM A. SCI-IRAK. 

